How to tell them apart
ないで attaches to a verb and means doing something without doing the verb first, or softens a request not to do it (買わないでおきました, 帰らないで下さい). なくて is the て form of ない itself, so it links a negative state or action as a cause or reason for what follows (分からなくて困りました). Swapping them is wrong because ないで cannot express cause, and なくて cannot mean without doing.
- ないで Use ないで when you mean without doing an action or when asking someone not to do something.
- なくて Use なくて when the negative state or action is the cause or reason for what comes next.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| ないで naide | Not doing something; a request or command not to do | N4 |
| なくて nakute | Negative te-form used to give a cause or reason | N4 |
ないで naide
Not doing something; a request or command not to do
ないで follows the plain negative form of a verb (ない form) and is used to tell someone not to do something, often in requests or commands. It commonly appears with 下さい to soften the request, as in the examples, and can sound direct or casual.
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ふふふ、ごめんあそばせ。気になさらないで下さいな！
Ha-ha-ha, pray forgive me. Please don't worry yourself about that!
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私のチョコレートを食べることを考えさえしないで。
Don't you even think of eating my chocolate!
なくて nakute
Negative te-form used to give a cause or reason
なくて is the negative form turned into a te-form, so it links a negative clause to what follows. It commonly marks a cause or reason, and after nouns or な-adjectives it appears as じゃなくて or ではなくて to mean 'not X but Y'. It follows the negative form of verbs and い-adjectives, and nouns or な-adjectives with じゃ/で.
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よく聞いたら、ネタじゃなくてマジボケだったみたいです。
When I asked afterwards it seems he hadn't said that as a joke.
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私はメアリーではなくてトムにそのニュースを話した。
I told the news to Tom, not to Mary.
ないで and なくて are both JLPT N4 grammar points that Japanese learners often mix up. This page compares them side by side on meanings, usage and example sentences, so you can tell them apart.